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On Friday, October 21, a massive cyberattack affected many users of popular websites like Twitter, Netflix, Etsy, Spotify and Airbnb, among others. Dyn, a company that manages website domains and routes internet traffic, experienced two distributed denial of service (DDoS) attacks on its DNS servers, beginning at 7am on Friday. A DDoS attack is an attempt to flood a website with so much traffic that it collapses under the load. Think the volume of a fire hydrant rushing through a garden hose.